Fault processing method for power distribution network connected with ground through small resistor of oil field

A technology of distribution network fault and small resistance grounding, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of low power supply reliability, unstable system operation, and oil pumping units not working normally, so as to reduce faults. The effect of reducing the scope of power outages, reducing the loss of power outages, and improving the efficiency of fault repair

CN107171296AActive Publication Date: 2017-09-15CHINA PETROLEUM & CHEM CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-09-15

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Abstract

The invention relates to a fault processing method for a power distribution network connected with the ground through a small resistor of an oil field. The fault processing method comprises the steps of seeking a position of a fault point when a fault occurs in the power distribution network of the oil field; disconnecting a circuit of the fault point by opening a circuit breaker, and judging whether the fault is a non-permanent fault or not; closing the opened circuit breaker when the fault is a non-permanent fault, and starting oil pumping unit set in a circuit disconnected with a bus in batches; and otherwise starting a power generator of the oil pumping set adjacent to the opened circuit breaker on the circuit disconnected with the bus, and providing an active power for the circuit disconnected with the bus. After the circuit fault is detected, corresponding fault processing is performed according to a type of the fault, so that normal working of the oil pumping unit set can be guaranteed.
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Description

technical field

[0001] The invention relates to a fault handling method for an oil field distribution network grounded through a small resistance. Background technique

[0002] In the petroleum industry, the oilfield distribution network grounded by a small resistance generally adopts a single power supply, and transmits and distributes power for the pumping unit through a radial network structure, that is, multiple pumping units are connected in series to the busbar. Since the pumping unit line is generally long, the line Therefore, the voltage drop at the end of the line is large, and the voltage of the pumping unit at the end of the line is relatively low; at the same time, since multiple pumping units are connected in series to the bus, when the line of one of the pumping units fails, it may It will cause all the pumping units connected thereafter to fail to work normally, and even cause a power outage on the whole line, with low power supply reliability and unstable sys...

Examples

Embodiment Construction

[0025] As shown in the figure, a fault handling method for an oil field distribution network grounded through a small resistance includes the following steps:

[0026] Firstly, set up the oil field distribution network. The oil field distribution network is composed of a bus connected to the power supply and a plurality of series-connected pumping units connected to the bus. Two adjacent groups of pumping units are connected through circuit breakers; pumping unit; several pumping units are preset for each pumping unit;

[0027] Secondly, when the oilfield distribution network is working normally, the generator of the terminal pumping unit provides reactive power for the terminal pumping unit, and the generators of the pumping units other than the terminal pumping unit are in hot standby state;

[0028] Again, when a fault occurs in the oilfield distribution network, find the location of the fault point; disconnect the line at the fault point by opening the circuit breaker, and...